IBM 6646, 6645, 6644 manual Undetermined Problems, Dimm

Undetermined Problems

If an error code, error message or error beeps is present, go to “Index of Symptoms, Messages, Error Codes, or Beeps” on page 36. If you did not receive any messages, error codes, or beeps, see if the symptom is listed in “Table 2-3 Error Symptoms List” on page 48. If you still cannot solve the problem, continue with this check:

1.Check the power supply voltages (See “Power Supply Connectors and Voltages” on page 107). If the voltages are correct, return here and continue with the following steps:

2.Power off the system unit.

3.Perform the following checks, one by one, until you have isolated the problem FRU (refer to “Parts/ Test Point Locations” on page 103 for locations):

-Load default settings in setup.

-Check all system board jumper positions and switch settings.

-Check all adapter card jumper positions.

-Check all device jumper positions.

-Check all cables and connectors for proper in- stallation.

4.If the jumpers, switch, and voltage settings are correct, continue with the following steps:

•Remove or disconnect the following, one at a time:

-Non-IBM devices

-External devices

-Any adapter card (modem card or video card, if installed)

-CD-ROM drive

-Hard disk drive

-DIMM

-Processor

-System board

5.Power on the system unit.

6.Repeat steps 2 through 5 until you find the failing device or adapter.

7.If software related, reload software from Recovery CD.

72 IBM Desktop System HMM